T-Mobile Dash User Manual - Select Menu > Options.

Synchronizing Information and Setting Up E-mail Security  51

3.6 Setting Up E-mail Security

Windows Mobile on your phone protects your Outlook e-mails through 

Secure/Multipurpose Internet Mail Extension (S/MIME), which allows you to 

digitally sign your messages as well as encrypt them.

Using authorization keys and certificates, S/MIME allows you to digitally sign 

your e-mail messages to prove your identity to the recipients. Authorization 

keys are also used when encrypting messages to improve privacy and 

prevent undue tampering or hacking of your messages. You can encrypt 

a message with or without a certificate. However, to read an encrypted 

message, you need a valid certificate for decrypting e-mail messages.

Note 

S/MIME encryption and digital signatures for Windows Mobile-based devices 

are available only with Exchange Server 2003 Service Pack 2 or a later version 

that supports S/MIME. If you are not using one of these products, or have not 

yet synchronized, these options are unavailable.

Digitally sign and encrypt all messages

ActiveSync allows you to set up S/MIME e-mail encryption and signing. You 

will have to obtain a valid certificate for signing or encrypting e-mail before 

you will be able to sign or encrypt mail successfully.

1. 

On the Home screen, select Start > ActiveSync.

2. 

Select Menu > Options.

3. 

Select the E-mail information type, and select Settings. On the E-mail 

Sync screen, select Menu > Advanced.